//
//  EmoticonAttachment.swift
//  表情键盘
//
//  Created by mac on 15/9/18.
//  Copyright © 2015年 itcast. All rights reserved.
//

import UIKit

class EmoticonAttachment: NSTextAttachment {
    /// 表情文字
    var chs: String
    init(chs: String){
        self.chs = chs
        
        super.init(data:nil, ofType:nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    class func emoticonAttributeText(emoticon: Emoticon, font: UIFont) -> NSAttributedString {
        
        let attachment = EmoticonAttachment(chs: emoticon.chs!)
        attachment.image = UIImage(contentsOfFile: emoticon.imagePath)
        //图片高度
        let height = font.lineHeight
        
        attachment.bounds = CGRect(x: 0, y: -4, width: height, height: height)
        
        //1,创建图片属性字符串
        let imageText = NSMutableAttributedString(attributedString: NSAttributedString(attachment: attachment))
        //2,添加字体
        imageText.addAttribute(NSFontAttributeName, value: font, range: NSRange(location: 0, length: 1))
        
        return imageText
    }
}
